In two of this summer's biggest action movies, the hero's mentor turns out to be a lying, manipulative sack of villainy. And nobody in the audience is surprised, because it's a scifi fact of life: mentors lie to you. They feed you half-truths ("Darth Vader killed your dad") and outright lies, to get you to follow… »7/01/08 4:00pm 7/01/08 4:00pm